There's a few possibilities. Initial state is certainly one possibility; another would be a near-miss with another object that resulted in the ejection of a larger amount of lighter elements due to the short term increase in energy in the localized system, and another is that the proximity to the star and constant barrage of solar wind has driven off part of the outermost layers.
We'll probably find out more with additional study. No matter what, it's interesting stuff!
Krinberry t1_je50zki wrote
Reply to comment by ShiloX35 in Webb telescope finds a 'hot Jupiter' exoplanet that defies expectations by maki23
There's a few possibilities. Initial state is certainly one possibility; another would be a near-miss with another object that resulted in the ejection of a larger amount of lighter elements due to the short term increase in energy in the localized system, and another is that the proximity to the star and constant barrage of solar wind has driven off part of the outermost layers.
We'll probably find out more with additional study. No matter what, it's interesting stuff!